/* Copyright (c) 2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package com.google.wave.api;

import java.io.Serializable;

/**
 * A class that models a range, that contains a start and end index.
 */
public class Range implements Serializable {

  /** Start of the range. */
  private final int start;

  /** End of the range. */
  private final int end;

  /**
   * Constructs a range object given a start and end index into the document.
   *
   * @param start the start of the range.
   * @param end the end of the range.
   */
  public Range(int start, int end) {
    this.start = start;
    this.end = end;
  }

  /**
   * Returns the starting index of the range.
   *
   * @return the starting index.
   */
  public int getStart() {
    return start;
  }

  /**
   * Returns the ending index of the range.
   *
   * @return the ending index.
   */
  public int getEnd() {
    return end;
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + end;
    result = prime * result + start;
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }

    if (obj == null) {
      return false;
    }

    if (getClass() != obj.getClass()) {
      return false;
    }

    Range other = (Range) obj;
    return start == other.start && end == other.end;
  }

  @Override
  public String toString() {
    return "Range(" + start + ',' + end + ')';
  }
}
